Stove.



PATENTED NOV. 20, 1906. W. V. ROBINSON. STOVE.

APPLICATION FILED Dmlz. 1904.

UNITED `STATES PATENTA OFFICE.

WILLIAM vV. ROBINSON, OF DETROIT, MICHIGAN, ASSIGNOR TO ART STO'VE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

Specification of Letters Patent.

STOVE.

Patented Nov. 20, 1906.

T0 all whom t may concern:

Be it known that I, WILLIAM V. ROBINSON', a subject of the King of Great Britain, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Stoves, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to stoves vof that type in which air for supporting combustion is fed through grooves or passages formed in the wall of the fire-pot.

The invention consists in certain novel features of construction, as hereinafter set forth'.

In the drawings, Figure l is a vertical longitudinal section on line w w of Fig. 2. Fig. 2 is a horizontal section with portions thereof in different planes, indicated by the lines y y, and z z of Fig. l.

Heretofore stoves of the type above referred to have been formed in which the :lirepot is provided. with a series of vertically-extending grooves open at their lower ends into the ash-pit and drawing air therefrom for supporting combustion at the sides and top of the mass of fuel within the fire-pot. With certain kinds of fuel it has been found desirable to provide a closed grate at the bottom of the fire-pot, so that practically all of the air for supporting the combustion passes by way of thegrooves during the normal operation of the stove. Other kinds of fuel require the admission of air through the grate as well as through the grooves in the fire-pot, and as a consequence stoves constructed with a closed grate will not operate satisfactorily with such fuel.

The present construction is particularly designed to secure the advantages of the closedgrate construction in combination with an open grate, which is equally well adapted for use with all kinds of fuel.

To this end the invention consists in the means employed for admitting the draft to the grooves in the fire-pot and to the chamber below the grate, as hereinafter described.

As shown, A is the ash-pit section, which is closed to form a practically air-tight chamber, but is provided with an air-damper B in the door C thereof.

D is the fire-pot, preferably a casting and provided with a series of vertical grooves a,

distributed around. its inner wall. These grooves are open at their lower ends and communicate with the chamber within the ash-pit and at their upper ends connect with apertures b, extending outward through the fire-pot. Below these apertures b is the annular flange c, preferably integral with and extending outward from the wall of the firepot.

E is a ring which is seated upon a bearing d at the outer edge of the fiange c and at its upper and inner edge is also seated in a groove e, formed -at the upper end of the iirepot wall. Thus the flange c and the ring E together form an annular air-chamber surrounding the fire-pot and communicating through the aperture b with the upper ends of the grooves (l.

The lower end of the fire-pot is seated on an inwardly-extending top wallf of the ash-pit A. This wall f is provided with a series of apertures g, surrounding the bearing for the fire-pot.

F is a ring surrounding the lower end of the fire-pot, which is seated on a bearing h on the wall f and forms an annular air-chamber communicating with the ash -pit chamber through the apertures g. i represents apertures in the wall of the fire-pot, connecting this annular air-chamber, respectively, with the grooves a.

G is a damper-slide controlling an opening in the ring F, and H is a similar damper for the ring E.

I lis a grate which is preferably formed of a series of rocker-bars, these being shown as of triangular cross-section. The bars of the grate are sufficiently spaced from each other to provide intervening apertures j, through which air may pass into the body of the fuel from the ash-pit chamber. The grate-bars may be provided -with any suitable mechanism (not shown) for rocking them to shake out the ashes.

The stove being constructed as described, in operation when a fire is started air is admitted through the dampers B and G. This will freely supply the needed air for combustion to the uel within the iire-pot When the iire is well under way, the damper B is closed, which will cut off direct admission of air to the ash-pit chamber. The damper G still remaining open, the air admitted there- IOO to will then pass into the annular air-cham-v ber within the ring F and through the apertures i to the grooves a, from which it will pass into the fuel near the walls of the firepot. The draft caused by the ascending column of air in the grooves a will not only be supplied through the openings of the damper G, but will also produce an entraining eiiect into the annular air-chamber within the ring F, which will cause the air within the ashchamber to pass through the aperture g. As a consequence any leakage of air through the damper .B and through the joints of the ashpit casing instead of passing through the apertures between the grate-bars I, as shown in dotted arrows, willv pass through the apertures g and be fed into the grooves a, as indicated by full arrows.

It is evident from the above description that the stove will operate in practically the same manner as one provided with a closed grate. At the same time the construction is such that whenever it is advantageous to supply a draft through the grate into the body of fuel this may be done by an adjustment of the damper B. The damper H is employed chiefly as a check, which will supply air at the top of the fuel and diminish the draft through the grooves a.

eating with the outer air and with the upper portions of said air-passages, and means for governing the flow of air through said airchambers, respectively.

2. In a stove or furnace, the combination of a {ire-pot provided with a plurality of airpassages in communication with the interior of the fire-pot from the lower to the upper portion thereof, an air-chamber communicating with the outer air, with the ash-chamber, and with the lower portions of said passages, an air chamber communicating with the outer air and with the upper portions of said air-passages, and means for governing the flow of air in said air-chambers.

In testimony whereof I affix my signature in presence oftwo witnesses.

WILLIAM V. ROBINSON.

Ii tnesses HARRrsoN L. DAvIEs GEO. A. MAIN. 

